The findings of this study showed that 4 weeks of 4-session per week plyometric training caused an increase in
EMG changes in the biceps femoris for the squat movement (absolute strength). The nature and type of plyometric
exercises add much force and tension to muscle cords. Performing such activities or tolerating extreme force and
tension may lead to needed physiological or biological changes in muscle cords and other parts of the contraction
system and can also cause muscle EMG changes to rise. Hence, at higher levels, when an athlete is trying to reach
maximum strength, it is probable that plyometric training will not be as influential as weight training. The findings
of Olson (2010) and Chimera (2004) verify these results, whereas those of Herrero (2006) and Arabatzi at al. (2010)
state otherwise.